Just upgraded to SW2018 and found out that they changed the way templates work. Previously the # of decimal places was set by the model, now it seems like the drawing controls it. Our old templates did not consider the # of decimal places because it was unimportant. However, and I fixed this, when I try to save a new template, it says "A document which references other documents may not be saved as a template". I was able to bypass this by saving as a .slddrw and changing the file extension. Now, though, when I create a new drawing using the template, the save-as window has .drwdot as the default file type and starts at my template folder. Previously it would automatically set the file name to match the model, and location to the model's folder location.